Lectrosonics UM700 User Manual download pdf (Page 11)

Digital Frequency Agile UHF Belt-Pack Transmitter

5-PIN INPUT JACK WIRING

The wiring diagrams shown on the next page represent the basic wiring necessary for the most common types of

microphones and other audio inputs. Some microphones may require extra jumpers or a slight variation on the

diagrams shown.

It’s virtually impossible to keep completely up to date on changes that other manufacturers make to their products. It

is possible that you may encounter a microphone that differs from these instructions. If this occurs please call our

toll-free number listed in the back manual. Our service department can answer your questions regarding micro-

phone compatibility.

When used on a wireless transmitter, the microphone element is in the proximity of the RF coming from the transmit-

ter. The nature of electret microphones makes them sensitive to RF, which can cause problems with the microphone/

transmitter compatibility. If the electret microphone is not designed properly for use with wireless transmitters, it may

be necessary to install a chip capacitor in the mic capsule or connector to block the RF from entering the electret

capsule. This modification is shown on the next page.

40k

100

POS BIAS (OR GND)

MIC

SOURCE LOAD

LINE IN

NEG GND (OR BIAS)

10uF

330pF

LECTROSONICS

3.2V Mic Bia

To Mic Amp

Input Jack Input Circuit

PIN 1 Shield (ground) for positive biased electret lavaliere microphones. For the increasingly rare negative biased

electret lavaliere microphones, it is the bias voltage source. It is also the shield (ground) for dynamic micro-

phones and line level inputs.

PIN 2 Shield (ground) for negative biased electret lavaliere microphones. Bias voltage source for positive biased

electret lavaliere microphones.

PIN 3 Low impedance microphone level input for dynamic microphones. Also accepts hand-held electret micro-

phones that have their own battery or power supply.

PIN 4 4K Ohm source load for non-Lectrosonics electret microphones. Use in conjunction with other pins to

provide attenuation of high level input signals.

PIN 5 40k high impedance, line level input for tape decks, mixer outputs, musical instruments, etc.

Rio Rancho, NM – USA

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Lectrosonics UM700 User Manual Page 11